Rogers field



(No Model.)

B. FIELD.

INTERMITTENT SIPHON.

No. 485,759. Patented Nnv. 8, 1892.

WITNESSES. NVENTOR.

R0 ers field. p I

UNITED STATES PATENT OFFICE.

ROGERS FIELD, OF LONDON, ENGLAND.

INTERMITTENT SIPHON.

SPECIFICATION forming part of Letters Patent No. 485,759, dated November8, 1892.

Application filed January 5, 1891. Serial No. 376i806. (No model.)Patented in England August 1, 1883 110.11.165, and in France June 1,1889.N0.198.674.

To all whom it may concern.-

Be itknown that I, ROGERS FIELD, a citizen of England, residing at No. 7Victoria Street, London, in the county of Middlesex, England, haveinvented a new and useful Improvement in Intermittent Siphons, (forwhich I have obtained a patent in Great Britain, dated August 1,1888,No. 11,165,and in France, dated June 1, 1889, No. 198,674,) ofwhich the following is a specification.

When a siphon is employed to discharge intermittently the contents of atank which is supplied by a slow flow of liquid into it, there is greatdifficulty in starting the siphon action, especially if the supply isvery small, as the liquid merely flows in a small stream down the longerlimb of the siphon without effecting sufficient displacement of the airto bring the siphon into full action.

My invention relates to a construction of siphon whereby this difficultyis overcomethat is to say, when the level of liquid in the tank israised to a certain point the addition of a very small quantity causesthe siphon to start into action. For this purpose I employ a siphon ofthe annular kind, consisting of a bell or deep basin placed invertedover the discharge-pipe or longer limb of the siphon, so that the liquidflows up the annular passage between the bell and the discharge-pipe andoverflows into the latter, the lower end of which is immersed in liquid.I make this bell of a diameter at the bottom considerably greater thanthe discharge-pipe and taper it upward to a smaller diameter at thelevel of the upper mouth of the pipe, above which it is completed in theform of a dome, the middle portion of which may be bent down. To theupper mouth of the discharge-pipeI apply an ajutage or mouthpiece of thefollowing description: Internally it has the form of a frustum of ahollow cone having its upper mouth as large as the discharge-pipe andits lower mouth of less diameter. The upper edge of this aj utage islevelforabouta third or a fourth part of its circumference and for therest of its circumference is made of a lower level, being aboutone-eighth of an inch lower at each extremity and sloping down to adepth of about one-fourth of an inch at its middle. In the central lineof this deepest part of the to cause the level of the liquid within thebell to rise. This rise increases the overflow into the discharge-pipeand eXpels a further quantity of air, which again causes a still largerrise and overflow, and thus brings the siphon into full action.

I am aware that siphons have been made having for an ajutage a conicalshell inverted in the discharging-limb of the siphon. This form isobjectionable, in that its action is uncertain or defective unless thesiphon be set quite vertically. The lower and smaller rim of the conemust be of sufficient diameter to aii'o rd afree water-way. Hence theoverflow cannot be delivered at or near the middle of the siphon-limb,but must fall comparatively near to its walls, and if a slightinclination be given to the siphon the overflowwill fall upon thesewalls and will not produce the desired effect. I am also aware thatsiphons have been made having an ajutage in the shape of a lipprojecting from one side of the upper edge of. the discharging-limb insuch a manner as .to deliver the liquid near the middle of the tube.This form is objectionable, because should the siphon be set verticallyand the upper edge of its discharginglimb be true the rising liquid willoverflow all points of its edge at once and the larger portion of suchoverflow will trickle down the part of the overflow, that which isdelivered inside surface of the tube, while but a small part of theoverflow, that which is delivered over the lip, is efficient for theextraction of air,

Should the siphon not be set vertically, the liquid will overflow onlyat the lowest part of the edge of the discharging-limb. This may or maynot be the part to which the lip is attached.

In my invention the fixed point of overflow, made by cutting away aportion of the upper rim of the ajutage, as described, insures thedelivery of the overflow through the lip or spout oliwhich projects theliquid to the middle of the-tube B, causing it to fall free of itswalls, although the inclination of the siphon be considerable. When theliquid falling from the spout d has partially rarefied the air and hasso induced a more copious overflow, the whole of the ajutage D becomesof use in delivering the discharge, so as to cause full siphonic actionspeedily.

Besides employing a bell and an ajutage such as I have described I findit in many cases advantageous to provide the outletmouth of thedischarge-pipe with an appliance for facilitating the action of a smalloverflow in and for regulating the issue of the air. For this purpose Icut at the lower mouth of the discha ge-pipe several small notches, theupper and inner edge of each notch being sharp as a chisel, the interiorof the pipe representing the straight side of the chisel and the slopefrom thechisel-edge to the outer circumference of the pipe representingthe beveled edge of the chisel. is expelled by a small overflow ofliquid into the dischage-pipe, it finds its-way through one or other ofthese notches and bubbles up through the liquid in which the lower mouthof the pipe is immersed. The air being thus discharged outside the pipe,the pressure within the pipe and bell is so far reduced that the liquidrises within the bell and overflows in larger quantity into thedischargepipe, thus producing the action above stated. All especialfunction of these notches is to regulate the issue of air, so that itshall escape frequently in small bubbles rather than occasionally inlarge bubbles, as would be the case if the lower mouth of thedischarge-pipe were not notched. When the air is allowed to escape inlarge bubbles, it sometimes happens that the sudden issue of a largequantity of air causes the water within the bell of the siphon torisewith a sudden jump, sending a few drops of water over the ajutagebefore the general level of the Water in the bell. is at a sufficientheight to cause a regular overflow. By this means a false action isstarted. When the lower end of the discharge-pipe is provided withnotches of the form described above, the air escapes in smallbubbles andthe resultant pulsation of water in the bell is so slight that no falseaction is set up.

Figure 1 shows a vertical section of a siphonconstructed according to myinvention. Fig. 2* is a horizontal section. Fig. 3 is a side viewfof-thelower end of the discharge-pipe drawn to a larger scale. Fig. 4 is avertical section of the same.

When a little air The siphon consists of the outer or receiving limb orbell A, which is contracted and domed at the top, and the inner ordischarging limb B, which preferably, as shown in Fig. 2, is setsomewhat eccentric in A in order to give ample room for upward flow ofliquid on the side where it first flows over the lip of the ajutage. Theouter limb or hell is kept in position by three wings 0, projecting fromthe inner limb. The ajutage D is of conical form. A portion cl of itsupper edge, extending through a third or a fourth part of thecircumference, is level and the remainder is made somewhat lower,sloping down to a slight extent to its deepest part in the middleopposite the higher portion. In order to set the higher portion cllevel, agagepin cl is provided on the opposite side of the ajutage.

On that side of the ajutage where the edge is lowest a portion of thecone is carried down as a spout (1 preferably perforated, as shown at'cl At the lower edge of the limb B are out several notches b, the metalin each notch being cut to chisel'shape, so as to present a sharp edgeon the inside, as shown more clearly at Figs. 3 and 4.

I do not wish to confine myself to the precise form of apparatus hereindicated. The pipe B may stand concentric within the pipe A. Theajutage may be longer or shorter and for different cases may havedifferent angles, and in certain cases the perforation of the ajutagemay be dispensed with.

Having thus described the nature of my invention and the best means Iknow for carrying the same into practical effect, I claim 1. Incombination with the discharginglimb of a siphon, the conical ajutage D,one' portion of which is prolonged downward as a spout, constructed andoperating substantially as described.

2. An intermittent siphon consisting of an outer or receiving limb orbell A and an inner or discharging limb or pipe B, with its ajutage Dand its notches 1), arranged and 0peratin g substantially as described.

In testimony whereof Ihave signed my' name to this specification, in thepresence of two subscribing witnesses, this 12th day of August, A. D;1890. V

7 ROGERS FIELD.

Witnesses:

CHAS. D. ABEL, Patent Agent, 28 Southampton Buildings,

London, W. (J.

J NO. P. M. MILLARD, Clerk to Messrs. Abel eh Imray, ConsultingEngineers and Patent Agents, 28 Southampton Buildings, London, W. O.

IIO

